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Sea Temperature in San Sebastian in September
Complete information on the sea temperature range in the Bay of Biscay in San Sebastian in September. Historical daily data. Climate details for September. Tips on swimming conditions and beach relaxation in San Sebastian. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.
Water Temperature Range in San Sebastian in September
19°C
MINIMUN
21.5°C
AVERAGE
24°C
MAXIMUM
Historical Data of Water Temperature in September in San Sebastian
Water Temperature Chart for Bay of Biscay in San Sebastian in September
Sea Temperature Table in San Sebastian in September Over the Past Years
| Day | 2024 | 2023 | 2022 | Average |
|---|---|---|---|---|
| Sep 1 | 22°C | 22°C | 22°C | 22.0°C |
| Sep 2 | 22°C | 23°C | 22°C | 22.3°C |
| Sep 3 | 22°C | 23°C | 21°C | 22.3°C |
| Sep 4 | 22°C | 22°C | 21°C | 21.8°C |
| Sep 5 | 21°C | 22°C | 21°C | 21.8°C |
| Sep 6 | 21°C | 23°C | 21°C | 21.8°C |
| Sep 7 | 23°C | 22°C | 22°C | 22.3°C |
| Sep 8 | 22°C | 22°C | 21°C | 21.8°C |
| Sep 9 | 22°C | 22°C | 21°C | 21.5°C |
| Sep 10 | 22°C | 22°C | 21°C | 21.5°C |
| Sep 11 | 21°C | 22°C | 21°C | 21.3°C |
| Sep 12 | 21°C | 23°C | 21°C | 21.5°C |
| Sep 13 | 22°C | 22°C | 21°C | 21.5°C |
| Sep 14 | 21°C | 22°C | 21°C | 21.3°C |
| Sep 15 | 22°C | 23°C | 21°C | 21.5°C |
| Sep 16 | 21°C | 22°C | 20°C | 21.0°C |
| Sep 17 | 21°C | 23°C | 20°C | 21.0°C |
| Sep 18 | 22°C | 22°C | 20°C | 21.0°C |
| Sep 19 | 22°C | 23°C | 20°C | 21.3°C |
| Sep 20 | 21°C | 22°C | 20°C | 20.8°C |
| Sep 21 | 21°C | 22°C | 20°C | 21.0°C |
| Sep 22 | 21°C | 22°C | 20°C | 21.0°C |
| Sep 23 | 20°C | 22°C | 20°C | 20.8°C |
| Sep 24 | 21°C | 21°C | 20°C | 20.5°C |
| Sep 25 | 20°C | 22°C | 20°C | 20.5°C |
| Sep 26 | 20°C | 22°C | 20°C | 20.5°C |
| Sep 27 | 21°C | 21°C | 20°C | 20.5°C |
| Sep 28 | 21°C | 21°C | 20°C | 20.5°C |
| Sep 29 | 20°C | 21°C | 20°C | 20.3°C |
San Sebastian Climate and Swimming Opportunities in September
22°C
Average Day Air Temperature
15°C
Average Night Air Temperature
94 mm
Precipitation Amount per Month
10 days
Number of Rainy Days
12 hrs
Daylight
per Day
6 hrs
Sunshine
per Day
12 km/h
Average Wind Speed
75%
Average
humidity
San Sebastian lies within the Basque Country in Spain. The average daytime temperature in San Sebastian in September is 22°C (72°F), while the nighttime average is 15°C (59°F). There are typically 10 rainy days during the month, with a total precipitation of 94 mm (3.7 inches). The daylight duration in September in San Sebastian is 12 hours, with an average of 6 hours of sunshine per day. The average wind speed in September is 12 km/h (7 mph), and the humidity level is around 75%.
The water temperature in San Sebastian in September ranges from 20°C to 22°C (68°F to 72°F). At the beginning of the month, the average temperature is around 22°C (72°F), shifting to 21°C (70°F) by mid-September and reaching 21°C (70°F) in the last ten days. Overall, the average sea temperature in San Sebastian for September is 21°C (70°F). Optimal swimming conditions. The water is warm, and the air is comfortable for drying off and sunbathing.
Sea Temperature in September in Nearby Cities
Frequently Asked Questions About Water Temperatures in September in San Sebastian
What is the sea temperature in San Sebastian in September?
The water temperature in the Bay of Biscay in San Sebastian in September ranges from 20°C to 22°C (68°F to 72°F).
Is it possible to swim in the Bay of Biscay in San Sebastian in September?
The average sea temperature in San Sebastian in September is 21°C (70°F), and the air temperature is 22°C (72°F), so optimal swimming conditions. The water is warm, and the air is comfortable for drying off and sunbathing.